Added a boolean value to VertexAttributeToOpenGLTypeSize for normalisation

|SOURCE|
[Common/VertexAttribute]
* VertexAttributeToOpenGLTypeSize has another value returned which indicates
  whether the vertex attribute is normalised or not
[Common/PolygonCache]
* The normalised parameter of VertexAttributeToOpenGLTypeSize is used in
  glVertexAttribPointer to set wheter the vertex attribute is normalised